[infinispan-dev] Zero-copy buffer transfers

[William Burns]

Bela,

You are thinking something like Netty's composite byte buffer?

http://netty.io/4.0/guide/#architecture.5

On 5/23/13 2:09 PM, Manik Surtani wrote:
> Bela,
>
> We shouldn't need to wait for NIO2/JDK7 for this.  We can do this in JDK6
as well, granted the impl may not be as good unless run on a Java7 VM.

In the current NIO impl, unfortunately MulticastSockets are not
supported (MulticastChannel), only DatagramChannels, so I couldn't
implement multicasting, only TCP this way.


> Do you have any notes on your designs somewhere?

Not really, but some JIRAs (se below). The main idea is that JGroups
passes a list of buffers directly to the socket which then creates
packets by writing them in sequence (gathering writes). One of the
buffers will be the buffer passed by Infinispan to JGroups; JGroups then
doesn't copy it into one single larger buffer, but passes it directly to
the socket, avoiding a copy.

- https://issues.jboss.org/browse/JGRP-815
- https://issues.jboss.org/browse/JGRP-809
- https://issues.jboss.org/browse/JGRP-816



--
Bela Ban, JGroups lead (http://www.jgroups.org)
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